package d2gui import ( "errors" "github.com/OpenDiablo2/OpenDiablo2/d2common/d2interface" ) var ( ErrWasInit = errors.New("gui system is already initialized") ErrNotInit = errors.New("gui system is not initialized") ) var singleton *manager func Initialize() error { verifyNotInit() var err error if singleton, err = createGuiManager(); err != nil { return err } return nil } func Render(target d2interface.Surface) error { verifyWasInit() return singleton.render(target) } func Advance(elapsed float64) error { verifyWasInit() return singleton.advance(elapsed) } func CreateLayout(renderer d2interface.Renderer, positionType PositionType) *Layout { verifyWasInit() return createLayout(renderer, positionType) } func SetLayout(layout *Layout) { verifyWasInit() singleton.SetLayout(layout) } // ShowLoadScreen renders the loading progress screen. The provided progress argument defines the loading animation's state in the range `[0, 1]`, where `0` is initial frame and `1` is the final frame func ShowLoadScreen(progress float64) { verifyWasInit() singleton.showLoadScreen(progress) } func HideLoadScreen() { verifyWasInit() singleton.hideLoadScreen() } func ShowCursor() { verifyWasInit() singleton.showCursor() } func HideCursor() { verifyWasInit() singleton.hideCursor() } func verifyWasInit() { if singleton == nil { panic(ErrNotInit) } } func verifyNotInit() { if singleton != nil { panic(ErrWasInit) } }